Flexible stay-bolt for boilers.



J. R. PLANNERY.

FLEXIBLE STAY BOLT FOR BOILERS.

APPLICATION FILED MAY 5, 1913'.

Patented Sept. 22,-1914.

Altarmy o M W m STATES PATENT ()FFIOE.

T JOHN aoenns tu my, or rrrrssunen, PENNSYLVANIA, Assrenon r PLANNER?BOLT GOMPANYfOF PITTSBURGH, PENNSYLVANIA.

FLEXIBLE STAY-BOLT FOR BOILERS.

Specification of Letters Patent.

PatentedSept. 22, 1914.

Toj all whom it may concern Be it known that I, Join: Rooms FLAN- NERY,of Pittsburgh in the county of Allegheny and State of Pennsylvania, havein-- vented certain .new anduseful Improve- I lments in FlexibleStay-Bolts for Boilers;

and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in-theart to which it appertains to make and use the same.

My invention relates to an improvement in flexible stay bolts forboilers, and :it consists in the details of construction and combinationof parts as will be more fully de'-' scribed and pointed out in theclaims.

In'the accompanying drawings, Figure 1 is a View showing my improvementapplied to the inner and outer sheets of a boiler, the connectors beingshown in section, and Fig. 2 is a similar View of a modified form.

1 represents the outer sheet and 2 the inner sheet of a boiler, each ofwhich is provided with a female threaded opening for the attachment ofthe connectors.

The connector in the outer sheet 1 comprises an externally threadedsleeve or bushing 3, provided internally adjacent its outer end, with acurved seat 4, conforming in shape to the spherical head 5 on the bolt6, the inner end of the sleeve or bushing being internally flared so asto permit of free movement of the bolt in any direction. The outer endof the sleeve or bushing 3, is closed by a cap 7, having internalthreads to engage the external threads at the outer end of the sleeve,and also provided with an annular shoulder 8, which latter abuts againstthe outer end of the sleeve.

The inner face of the cap 7 is curved to conform to the contour of thespherical head 5, and normally is slightly removed from the head so asto provide'for a slight expansion of the bolt.

The sleeve 3, as shown in Fig. 1 projects outwardly beyond the outersheet sufiiciently to carry the bearing 4 for the bolt head 5 into aplane beyond said sheet, while the sleeve 9 in which the opposite end ofthe boltis mounted, is so located with relation to the inner sheet 2,that the bearing for the inner head is in a plane intermediate the tw"sheets. This sleeve 9 is threaded .externaily and is screwed into anopening in theinner sheet 2, with its outerend flush with the face ofsaid sheet. -It is provided nternally with an integrally curved bearingfor the head 11 of the bolt, and Internally threaded at its outer endfor the reception of the cap 12, which, when in place, rests against theannular shoulder 13 of the sleeve 9, with its outer surfaceapproximately flush with. the

outer face of the inner sheet 2. The inner face of cap .12 is curved toconform to the contour of thehead 11 of'bolt 6. r This head '11 issmaller than head 5, and is provided with a threaded socket into whichthe V threaded end or, bolt .6 screwed. The

. ,bpltmay be cylindrical as shown in full lines or tapering as shown indotted lines. To apply the'bolt to its connectors or sleeves, the caps 7and 12 of the sleeves, and the head '11 of the boltare removed, and thebolt is passed through 'sleeve 3 and into sleeve 9 after which the head11 is screwed onto the bolt and the caps 7 and 12 screwed into place.

In the construction shown in Fig. 2, the bolt is shortened up consideably and is mountedat its two ends in sleeves 9* similar in all respectsto the sleeve 9 of Fig. 1, so that both heads of the bolt are supportedin planes intermediate the two sheets. In Fig. 2,,the removal head 11 ishowever approximately the same size as the integral head 5. Theprincipal feature of this bolt is that it has spherical heads at bothends, which heads are mounted in substantially spherical bearings in thesleeves so as to compensate for the contraction and expansion whichtakes place in both sheets. Where the ball and socket principle ofconnection is applied to,

one sheet only, theopposite end of the bolt being threaded into theinner sheet, there is always slight movement in the threaded connectionbetween the inner end of the bolt and the inner sheet, and while themovement is slight, a continuation of it will eventually cause leakageand crystallization of the metal in the bolt.

As the modern locomotives are gradually enlarging their fire boxes,there will naturally be greater expansion and contraction because of thegreater surfaces exposed to the fire and cold air. By making both endsflexible this objection will be overcome, and by making both headsspherical, without projections of any kind, and the seats in the sleevesand cap of a radius to conform to the curve of the heads, any.sedimentthat packs around the heads will simply reducethe size of the cavitieswithout interfering in the least with the universal movement of theheads. With bolts having heads that are not spherical, the sediment orscale forming between the eccentric portion of the heads and the sleevesand caps, will in time, bind the heads so that there can be no movementof any kind, but with spherical heads and bearing conforming thereto,the sediment that settles around the head, while it may fill the cavity,cannot prevent the free movement of the spherical heads on their seats.

It is evident that many slight changes might bercsorted to in therelative arrangement of parts shown and desciibed Without departing fromthe spirit and scope of my invention as set forth in the claim annexed.

Hence I would have it understood that I do not wish to confine myself tothe exact Construction and arrangement of parts shown and described, but

Having fully described my invention what I elaimas new and desire tosecure by Letters-Patent, is I v In a stay bolt for boilers, thecombination of acpair of oppositely disposed sleeves'each open at itsends, and each provided with an integral internal curved seat, a staybolt having two approximately spherical heads one of which is detachablysecured to the bolt, the said heads resting against the curved seats inthe sleeves, and caps for the sleeves, the inner faces of the caps beingJ OHN M. Ronny.

